Kind of silly to feed expensive feed to rodents then turn around and feed the rodents to chickens. Feed conversion per pound of meat goes way, way, down. Plus the disease factor. Chickens are just packed with various diseases and viruses that are held in check by the bird's immune system, just waiting for a crack in the resistance of one bird to wipe out a flock. Adding another layer of bacteria and viruses just makes things more likely to go wrong.
Waste or overage, too many rodents, not enough customers? You would still be better off marketing in advance and keeping pace with the production rather than disposing of excess inventory feeding them to birds.